My DIY custom tachometer scan gauge

I am very excited to share my project with this forum! I have spent the last few months working on it in my spare time.




I have been very curious about the mysterious behavior of my Prius. I decided to create this scan gauge to view RPM and engine temp. It is powered by an Arduino microcontroller and a CAN bus controller. I decided to take the hard route so there is no traditional ELM327 (regular bluetooth or usb) scan tool hardware in this project!

I have code posted on GitHub if anyone is interested in making their own.

 

Ah yes, I've seen that before. That was one of my sources of inspiration. MPGuino has a simpler principle of operation. My design is a little bit more complicated...uses OBD protocol over the CAN bus. I could really request any data I wanted from the ECU.

 

It is indeed ICE RPM. I am very curious to read what the traction motor RPMs are. It may give me more insight into the vehicle's top speed on electric only power. I know that there are a whole bunch of Prius-specific PIDs that can be requested from the ECU. I am very curious to see what I can find out from tinkering and experimenting.

 

This bad boy right here?

Will require some poking around. This will be a challenge since those don't look like regular OBD PIDs. I'm not sure how exactly they are implemented in the scan gauge. Something to keep me busy I suppose.

 

I forgot to post a link to my Instructables write up. More photos and details here.